Let me say first: TMNT has nothing to do with Japanese animation production companies. Please don't think about this problem in Japanese upstairs, which will only confuse [[ liegewizardshu ]] students and miss the point.

When a surfer is standing on a surfboard facing the huge waves, Kawabangga (transliteration is "Kawabangga", and you call it "CHA BANG GA") is a slogan that must be shouted, just like a football goal and a "good shot".

Mickey has a dream to conquer the huge waves on the sea, but because of his alien status, he can't be found, and of course he can't surf on the sea. So it's normal for him to skateboard desperately in the sewer with this slogan.